[pkg/ottl] Allow Optional `KeyPath` in SliceToMap

[XuechunHou]

Component(s)

pkg/ottl

Is your feature request related to a problem? Please describe.

The current implementation of SliceToMap has a required argument, keyPath, which expects an array of keys from the input slice of objects. These objects need to have a same key. The values corresponding to these keys must be strings.

This restriction limits the use cases of this function. The given slice of objects might not always have an entry with the same key.

Describe the solution you'd like

Mark keyPath Optional. If keyPath isn't specified, use the string representation of the index when looping through objects in the slice.

i.e:

type SliceToMapArguments[K any] struct {
	Target    ottl.Getter[K]
	KeyPath   ottl.Optional[[]string]
	ValuePath ottl.Optional[[]string]
}

m1 := {
"data1": "param1"
"data2": "param2"
}

m2 := {
"data3": "param3"
"data4": "param4"
}

Target := []any {m1, m2}
SliceToMap(Target) -> {
  "0": {
  "data1": "param1"
  "data2": "param2"
  }

  "1": {
  "data3": "param3"
  "data4": "param4"
  }
}

Describe alternatives you've considered

N/A

Additional context

N/A

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[github-actions]

Pinging code owners:

• pkg/ottl: @TylerHelmuth @evan-bradley @edmocosta

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[VihasMakwana]

Thank you!

The description and use case makes sense to me.